Area Forecast Discussion
Issued by NWS Riverton, WY

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000
FXUS65 KRIW 142028
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
128 PM MST Sat Jan 14 2017

.Short Term...Tonight Through Tuesday

Cold dry high pressure will remain over the area through
Monday night. The valleys and basins will remain cold with
strong temperature inversions and light wind. the mountains and
foothills will warm as will the eastern plains in natrona and
southern johnson county where southwest winds will increase. the
south will remain cloudy with patchy fog...while the valleys and
basins will have fewer clouds but will have patchy fog as well.
Monday night and Tuesday clouds will move into the west ahead of a
Pacific low pressure trough which will move towards the Pacific
Northwest coast. The clouds will aid in warming.

.Long Term...Tuesday night Through Saturday

Some light snow may develop in the higher mountains of the west
late Tuesday on the eastern edge of the cloud mass associated with
the incoming Pacific trough. A better chance of light mountain
snow across the west will move in Wednesday and Wednesday night.
Snowfall is expected to increase in both coverage and intensity
across the west and southwest Thursday and southwest winds will
become stronger and more widespread over and near the east slopes
of the mountains east of the Continental Divide and through the
wind corridor from Rock Springs to Casper. Strong winds will
likely occur in the cody foothills. As the clouds and wind
increase...temperatures will rise significantly with the Big Horn
and Wind River Basins warming last. Thursday night a weak Canadian
cold front is expected to move into northern Wyoming with areas
of snow developing across the north. Areas of snow will continue
across the mountains and north Friday. The main Pacific low
pressure trough is modeled to dig south into the Great Basin
drawing much of the moisture south of the area Friday night. As
the low develops south towards the four corners area...north
northeast winds will develop across the area with colder air and
areas of low clouds and snow developing Friday night and Saturday.

&&

.Aviation.../00Z Issuance/

The Rock Springs terminal will likely observe IFR/LIFR conditions in
low stratus and/or fog today, through tonight and through Sunday
morning through 18z with airfield minimums a good possibility. The
fog could temporarily lift and thin out briefly through 02z.
Patchy fog may reform at KBPI, KJAC, KLND, KPNA, and KRIW after
06z tonight and persist through 18z Sunday. Winds will be mainly
light across the entire area through the period except from the
Red Desert to KCPR where southwest winds of 15 to 25 knots are
expected through 00z this evening followed by sw winds of 10 knots
through sunday.

&&

&&

.Fire Weather...

Cold dry high pressure will remain over the area through
Monday night. The valleys and basins will remain cold with
strong temperature inversions and light wind. the mountains and
foothills will warm as will the eastern plains in natrona and
southern johnson county where southwest winds will increase. the
south will remain cloudy with patchy fog...while the valleys and
basins will have fewer clouds but will have patchy fog as well.
Monday night and Tuesday clouds will move into the west ahead of a
Pacific low pressure trough which will move towards the Pacific
Northwest coast. The clouds will aid in warming. With cold air
trapped in the valleys and basins with increasing temperature
inversions...mixing will be limited and wind will be light
combining for poor smoke dispersal expected through Monday.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$

SHORT TERM...C.Baker
LONG TERM...C.Baker
AVIATION...Lipson
FIRE WEATHER...C.Baker



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